Bindings not set for items not visible - windows-phone-8.1

Question

Sorry if this is a dumb question. I am maintaining this crazy Windows Phone 8.1 RT dynamic app that I didn't write. It loads up a whole bunch of stuff to the DataContext. Things that aren't visible on the screen don't seem to get their DataContext. When I navigate away from the form the event fires. What do I need to do to fix that? Even when it scrolls into view it doesn't load. If I scoll up and click the back button I see the field populate before it goes to the previous page.
Edit - Here is some code:
<DataTemplate x:Key="com.somecompany.BarcodeboxRenderer">
<Grid HorizontalAlignment="Stretch" DataContext="{Binding Item1}">
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Label}" HorizontalAlignment="Stretch" Style="{StaticResource labelstyle}" Grid.Row="0" />
<somecompany:BarcodeBox IsReadOnly="{Binding DisplayOnly}" somecompany:DynamicDataBindingPath.BindingPath="{Binding FieldId}" Grid.Row="1" />
</Grid>
</DataTemplate>
That calls this but only if it's visible:
public sealed class DynamicDataBindingPath:FrameworkElement
{
public static readonly DependencyProperty BindingPathProperty = DependencyProperty.RegisterAttached("BindingPath", typeof(string), typeof(DynamicDataBindingPath), new PropertyMetadata("", OnBindingPathPropertyChanged));
public static string GetBindingPath(FrameworkElement target)
{
try
{
return (string)target.GetValue(BindingPathProperty);
}
catch (Exception)
{
return string.Empty;
}
}
public static void SetBindingPath(FrameworkElement target, string value)
{
target.SetValue(BindingPathProperty, value);
target.Loaded += Target_Loaded;
}
private static void Target_Loaded(object sender, RoutedEventArgs e) {
var target = (FrameworkElement)sender;
if (target is ...) { ... }
else if (target is DatePicker)
{
int startingletterindex = value.IndexOf('.') + 1;
string pathtobindto = "obj." + Char.ToUpper(value[startingletterindex]) + value.Substring((startingletterindex + 1));
Binding newbind = new Binding();
newbind.Path = new PropertyPath(pathtobindto);
var contextsrc = findRealDataContext(target);
newbind.Source = contextsrc.DataContext;
newbind.Mode = BindingMode.TwoWay;
(target as DatePicker).SetBinding(DatePicker.DateProperty, newbind);
}
else if (...)
}

Answer 1

I turned of ListView Virtualization and it works now. I don't need it because there will never be more than a handful of rows.